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<DIV>Hi, Guys</DIV>
<DIV>As a follow-up to Vance’s comments (which I fully agree with) you may be
interested to know how we position thrusters on our new and much heavier Dual
DeepWorker 3000. This 3000 foot (actually 3400 ft.) version of our Dual
DeepWorker 2000 uses 6 thrusters – two verticals , (straight up and down, fore
and aft on centerline, not in the vectored position of the much lighter single
DeepWorker)
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">,
two aft horizontals and and two forward horizontals which are angled 15 degrees
off the hull parallel plane to allow tight turns and very precise lateral
maneuvering control while working with the dual manipulators on
bottom.</DIV></DIV>
<DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">The
first of the DDW3000’s finished certification sea-trials day before yesterday
and will be shipped out next week – now we have seven more to build for our
current contract and a lot of interest in follow-up builds. I got to dive the
new dual for the first time last Thursday – pretty slick! </DIV></DIV>
<DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">The
foregoing might be plainer if I post a couple of pics of the
DDW3000.</DIV></DIV>
<DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">Phil</DIV></DIV>
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<DIV>
<DIV
style="FONT-SIZE: small; FONT-FAMILY: 'Calibri'; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; TEXT-DECORATION: none; DISPLAY: inline">F<B>rom:</B>
<A title=vbra676539@aol.com
href="mailto:vbra676539@aol.com">vbra676539@aol.com</A> </DIV>
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<DIV><B>Sent:</B> Saturday, September 14, 2013 8:38 AM</DIV>
<DIV><B>To:</B> <A title=personal_submersibles@psubs.org
href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</A>
</DIV>
<DIV><B>Subject:</B> Re: [PSUBS-MAILIST] tilting thrusters</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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color=black size=3 face="Arial, Helvetica, sans-serif">
<DIV><FONT style="BACKGROUND-COLOR: transparent">I don't condemn or recommend
side thrusters, but I will give you a little experience and rumor based data to
consider.</FONT></DIV>
<DIV><FONT style="BACKGROUND-COLOR: transparent"></FONT> </DIV>
<DIV><FONT style="BACKGROUND-COLOR: transparent">Side thrusters require durable
and robust motor controllers and (preferably) a tilting control NOT requiring
both hands. Long transects either on the surface or underwater are
difficult without some kind of autopilot or at least a trim tab/rudder aft.. If
you lose power to one of them (short circuit, for instance) then you are reduced
to strictly rotary steerageway (as in, running around in circles). Also, you
will have no lateral capability with two thrusters on the
centerline.</FONT></DIV>
<DIV> </DIV>
<DIV>The Pisces class from Hyco used side thrusters successfully for many years,
but were (and are) limited in close maneuvering as you have to back and fill
rather than move laterally, as there are no maneuvering thrusters beyond the
side units. This can be ameliorated to a great extent on relatively lightweight
vehicles by the judicious use of vectored side thrusters (as in DW-2000 design).
Four fixed thrusters, two aft and two in the aforementioned vectoring position
allow very good maneuverability with the DWs.</DIV>
<DIV> </DIV>
<DIV>Perry never used side thrusters as primaries save on the ARMs bells and the
old Opsub (which was an early boat built to order for Ocean Systems and never,
as far as anyone knows, actually put into service in the oil fields). Instead,
they used pivoting centerline thrusters on the 18 series, which worked pretty
well.</DIV>
<DIV> </DIV>
<DIV>Other builders from the early days used side thrusters (Deepstar, Deep
Quest, et al) with varying degrees of success. It might be instructive to
remember that the Deepstar 4000 made only a very few hundred dives and was
considered a limited success based on lack of payload and
maneuvering/maintenance issues. Cool looking though, to be sure.</DIV>
<DIV> </DIV>
<DIV>As to compensation, all the comp thrusters I have dealt with are
compensated at the unit itself, so this was never a problem. </DIV>
<DIV><FONT face="Arial, Helvetica, sans-serif"></FONT> </DIV>
<DIV>Vance</DIV>
<DIV></DIV>
<DIV></DIV>
<DIV
style="FONT-SIZE: 10pt; FONT-FAMILY: arial,helvetica; COLOR: black">-----Original
Message-----<BR>From: Juergen Guerrero Kommritz
<groplias2@yahoo.com><BR>To: Personal Submersibles General Discussion
<personal_submersibles@psubs.org><BR>Sent: Sat, Sep 14, 2013 7:34
am<BR>Subject: [PSUBS-MAILIST] tilting thrusters<BR><BR>
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<DIV><SPAN>Hello <BR></SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: times new roman,new york,times,serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>I
need some help. I am seaching some information about lateral tilting thrusters
as main propulsion for a submarine. Most of the newer subs have fixed vertical
or horizantal thrusters. So there must be a big practical reason. I asume
it can be because problems with presure compensating of the motor. If this
wasn´t a problem which other problems will have to instal lateral tilting
thrusters?</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: times new roman,new york,times,serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>I
thanks in advance for any information, ideas ore hints.</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: times new roman,new york,times,serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>Best
wishes</SPAN></DIV>
<DIV
style="FONT-SIZE: 16px; FONT-FAMILY: times new roman,new york,times,serif; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent"><SPAN>Juergen<BR></SPAN></DIV>
<DIV> </DIV>
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